US20070178008A1 - Corrosion inhibitor treatment for closed loop systems - Google Patents
Corrosion inhibitor treatment for closed loop systems Download PDFInfo
- Publication number
- US20070178008A1 US20070178008A1 US11/343,709 US34370906A US2007178008A1 US 20070178008 A1 US20070178008 A1 US 20070178008A1 US 34370906 A US34370906 A US 34370906A US 2007178008 A1 US2007178008 A1 US 2007178008A1
- Authority
- US
- United States
- Prior art keywords
- recited
- fluid
- ppm
- phosphonate
- corrosion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
Definitions
- the present invention relates generally to a corrosion inhibitor treatment for closed loop systems. More specifically, the present invention relates to an environmentally friendly, non-molybdenum, and non-nitrite corrosion inhibitor treatment for closed loop systems.
- Corrosion of metallic components in industrial plants may cause system failures and sometimes plant shutdowns.
- corrosion products accumulated on the metal surface will decrease the rate of heat transfer between the metal surface and the water or other fluid media, and therefore corrosion will reduce the efficiency of the system operation.
- corrosion can increase maintenance and production costs and decrease the life expectancy of the metallic components.
- a combination of an organic acid, a triamine and a phosphonate compound surprisingly provides enhanced protection of metallic surfaces from corrosion in closed loop systems.
- the organic treatments of the present invention can provide good corrosion protection in aggressive water either with or without hardness, and even in corroded systems.
- the present invention provides an effective method of inhibiting corrosion on metallic surfaces in contact with a fluid contained in a closed loop industrial fluid system, which comprises adding to such fluid an effective corrosion controlling amount of a combination of an organic diacid, a triamine and a phosphonate compound.
- the diacid may be, e.g., sebacic acid.
- the triamine may be, e.g., triethanolamine
- the phosphonate may be, e.g., a polyisopropenyl phosphonic material of different molecular weights, or e.g., 1,6-hexamethylenediamine-N,N,N′,N′-tetra(methylene phosphonic acid), or e.g., N,N,-dihydroxyethyl N′,N′,-diphosphonomethyl 1,3-propanediamine, N-oxide.
- compositions of the present invention should be added to the fluid system for which corrosion inhibition activity of the metal parts in contact with the fluid system is desired, in an amount effective for the purpose. This amount will vary depending upon the particular system for which treatment is desired and will be influenced by factors such as the area subject to corrosion, pH, temperature, water quantity and respective concentrations in the water of corrosive species. For the most part, the present invention will be effective when used at levels up to about 10,000 parts per million (ppm) of fluid, and preferably from about 2,000-10,000 ppm of the formulation in the fluid contained in the system to be treated.
- the present invention may be added directly to the desired fluid system in a fixed quantity and in a state of an aqueous solution, continuously or intermittently.
- the fluid system may be, e.g., a cooling water or boiler water system.
- Other examples of fluid systems which may benefit from the treatment of the present invention include aqueous heat exchanger, gas scrubber, air washer, air conditioning and refrigeration systems, as well as employed in e.g., building fire protection and water heaters.
- the Corrosion Beaker Test Apparatus was used. The tests were run generally for 18 hours, at 120° F.; beakers were stirred at 400 rpm and open to air. The metallurgy was low carbon steel coupons and probes. The test was based on measuring corrosion through the established electrochemistry technique of linear polarization. The BCTA performed consecutive measurements by automatically multiplexing 12 beakers.
- the benchmark product was a molybdate, nitrite combination.
- the corrosion inhibitor was challenged in different ways as the water composition changed, in order to stop corrosion. Note that a good corrosion inhibitor should be able to stop corrosion in all the waters. As shown in Table I below, such is the case for the benchmark molybdate/nitrite combination.
- the conventional all organic treatment is ineffective in the CR water and in AGG*, aggressive water with no calcium. It is also a weak inhibitor in A/Fe water, or water with dissolved iron. TABLE I Corrosion rates measured in different waters, units of mils per year (mpy), for low carbon steel metallurgy with no treatment and with conventional treatments.
- the preferred diacid is sebacic acid, at a concentration of at least 500 ppm.
- the preferred amine is triethanol amine (TEA).
- TAA triethanol amine
- the preferred mass ratio of diacid (e.g., sebacic) to amine is at least 1:1.
- An increase of the concentrations of sebacic acid/TEA does not provide corrosion inhibition in all the synthetic waters.
- the worst protection is in the AGG, AGG* and A/Fe synthetic waters.
- sebacic acid/TEA at 500 ppm/500 ppm provides good corrosion protection, i.e., less than 0.05 mpy, in such waters. This is in contrast to its performance in AGG, AGG* and A/Fe waters; in those waters, corrosion protection is on the order of greater than 38 mpy.
- Table IV further demonstrates the unexpected results of the combination of diacid/amine/phosphonate, wherein a comparison of the corrosion rates in mpy as measured and as predicted is presented.
- the predicted corrosion rate is: a) calculated averaging the corrosion rates of the individual inhibitors phosphonate and diacid/amine, b) the corrosion rate as obtained with the best performer of the two, and c) calculated assuming a decrease in the corrosion rate of the best performer as the reduction on the rate of corrosion between the control water and the same water treated by the other inhibitor.
- TABLE IV mpy as TRV AGG AAG* A/Fe CR Phosphonate A 50 ppm, sebacic acid 500 ppm, triethanol amine 500 ppm.
Abstract
Description
- The present invention relates generally to a corrosion inhibitor treatment for closed loop systems. More specifically, the present invention relates to an environmentally friendly, non-molybdenum, and non-nitrite corrosion inhibitor treatment for closed loop systems.
- Corrosion of metallic components in industrial plants may cause system failures and sometimes plant shutdowns. In addition, corrosion products accumulated on the metal surface will decrease the rate of heat transfer between the metal surface and the water or other fluid media, and therefore corrosion will reduce the efficiency of the system operation. Thus, corrosion can increase maintenance and production costs and decrease the life expectancy of the metallic components.
- The most common way to combat corrosion is to add corrosion inhibiting additives to the fluid of such systems. However, currently available corrosion inhibiting additives are either non-biodegradable, toxic, or both, which limits the applicability of such additives.
- Regulatory pressures have been steadily increasing to eliminate discharge of molybdate and/or nitrite to the environment. Furthermore, nitrite treatments can develop serious microbiological growth in the closed loop. In actuality, the most reliable treatments to eliminate corrosion in closed loop systems are based on molybdate, nitrite or a combination of the two. Existing all-organic treatments do not perform well in systems where corrosion has occurred, and iron and/or iron oxide levels are high, or the water in the closed system has aggressive ions. The water composition as found in closed loops can vary significantly.
- Thus, environmental concerns are driving the use of corrosion inhibitors away from heavy metals, molybdenum and nitrite. Existing purely organic treatments, although desirable, are not reliable when applied in iron or iron oxide laden systems or aggressive waters. By their nature, closed loops are prone to have high iron.
- Therefore, there is a strong need for an environmentally friendly, non-molybdenum, non-nitrite corrosion inhibitor treatment for closed loop systems. In the present invention, a combination of an organic acid, a triamine and a phosphonate compound surprisingly provides enhanced protection of metallic surfaces from corrosion in closed loop systems. The organic treatments of the present invention can provide good corrosion protection in aggressive water either with or without hardness, and even in corroded systems.
- The present invention provides an effective method of inhibiting corrosion on metallic surfaces in contact with a fluid contained in a closed loop industrial fluid system, which comprises adding to such fluid an effective corrosion controlling amount of a combination of an organic diacid, a triamine and a phosphonate compound. The diacid may be, e.g., sebacic acid. The triamine may be, e.g., triethanolamine, while the phosphonate may be, e.g., a polyisopropenyl phosphonic material of different molecular weights, or e.g., 1,6-hexamethylenediamine-N,N,N′,N′-tetra(methylene phosphonic acid), or e.g., N,N,-dihydroxyethyl N′,N′,-diphosphonomethyl 1,3-propanediamine, N-oxide.
- The compositions of the present invention should be added to the fluid system for which corrosion inhibition activity of the metal parts in contact with the fluid system is desired, in an amount effective for the purpose. This amount will vary depending upon the particular system for which treatment is desired and will be influenced by factors such as the area subject to corrosion, pH, temperature, water quantity and respective concentrations in the water of corrosive species. For the most part, the present invention will be effective when used at levels up to about 10,000 parts per million (ppm) of fluid, and preferably from about 2,000-10,000 ppm of the formulation in the fluid contained in the system to be treated. The present invention may be added directly to the desired fluid system in a fixed quantity and in a state of an aqueous solution, continuously or intermittently. The fluid system may be, e.g., a cooling water or boiler water system. Other examples of fluid systems which may benefit from the treatment of the present invention include aqueous heat exchanger, gas scrubber, air washer, air conditioning and refrigeration systems, as well as employed in e.g., building fire protection and water heaters.
- The invention will now be further described with reference to a number of specific examples which are to be regarded solely as illustrative and not as restricting the scope of the present invention.
- Local tap water was used for testing, with 60 ppm of Ca (as CaCO3), 20 ppm Mg (as CaCO3), 4 ppm SiO2, and 35 ppm of M-Alk (as CaCO3): This water is identified as TRV. An aggressive water was tested, with 60 ppm of Ca (as CaCO3), 20 ppm of Mg (as CaCO3), 200 ppm of SO4, 4 ppm of SiO2, and 35 M-Alk ppm (as CaCO3): This water is identified as AGG. An aggressive water, but without calcium was also tested (similar to the AGG in composition but without calcium), containing 20 ppm Mg (as CaCO3), 200 ppm SO4, 51 ppm chloride as Cl−, 4 ppm SiO2, and 35 M-Alk ppm as CaCO3: This water is identified as AGG*.
- In order to simulate the presence of corrosion products, 3 ppm of initially soluble Fe+2 was added to a sample of the aggressive water, AGG: This water is identified as A/Fe. Because a closed system is made of iron pipes, and there is no constant elimination of the naturally occurring iron oxides that are present, a fifth water that could represent those characteristics was also designed. The stress of a highly corroded system was simulated by adding to the local tap water (TRV) a corroded pipe section, an iron oxide in a piece (3 g), 1050 ppm of ground oxide and 4 ppm of initially soluble Fe+2: This water is identified as CR or “iron crash test.” The iron oxides were taken from actual corroded pipes in the field.
- In order to test corrosion, the Corrosion Beaker Test Apparatus (BCTA) was used. The tests were run generally for 18 hours, at 120° F.; beakers were stirred at 400 rpm and open to air. The metallurgy was low carbon steel coupons and probes. The test was based on measuring corrosion through the established electrochemistry technique of linear polarization. The BCTA performed consecutive measurements by automatically multiplexing 12 beakers.
- The benchmark product was a molybdate, nitrite combination. In the set of synthetic waters, the corrosion inhibitor was challenged in different ways as the water composition changed, in order to stop corrosion. Note that a good corrosion inhibitor should be able to stop corrosion in all the waters. As shown in Table I below, such is the case for the benchmark molybdate/nitrite combination. The conventional all organic treatment is ineffective in the CR water and in AGG*, aggressive water with no calcium. It is also a weak inhibitor in A/Fe water, or water with dissolved iron.
TABLE I Corrosion rates measured in different waters, units of mils per year (mpy), for low carbon steel metallurgy with no treatment and with conventional treatments. Product or Chemical ppm TRV AGG AGG* A/Fe CR Control 0 64; 75 120; 125; 94; 94; 83; 99; 57; 40; 47; 167 85 111; 78 71 Conventional Molybdate 3000 <0.05; 0.1; 0.3 <0.05; 0.2; 0.1; <0.05; with nitrite <0.05 <0.05 <0.05 <0.05 Conventional all organic 2000 0.1; 0.2; 0.5 11; 10 2.9; 2.6 37 <0.05 - Four phosphonates were test ed. Two were experimental phosphonates (A=(N,N-dihydroxyethyl N′,N′,-diphosphonomethyl 1,3-propanediamine, N-oxide and B=1,6-hexamethylenediamine-N,N,N′,N′-tetra(methylene phosphonic acid)); the other two were poly (isopropenyl phosphonic) acid polymers (C is higher molecular weight and made in organic solution, whereas D is made in aqueous media and has smaller molecular weight). Polymers C and D were made as described in U.S. Pat. Nos. 4,446,046 and 5,519,102.
TABLE II Corrosion rates measured in waters as defined in text, units of mils per year (mpy) for low carbon steel metallurgy for phosphonates and the mixture of diacid amine. Chemical TRV AGG AGG* A/Fe CR ppm Phosphonate A 10 56 Phosphonate A 50 0.4; 0.9 9.2 80 54 54 Phosphonate A 100 <0.05 4.5 17; 34 13 Phosphonate A 200 1.1 Phosphonate A 250 0.1; 1.5 1.8; 1.8 20 <0.05 Phosphonate A 300 1.1 Phosphonate A 500 0.1 0.3 10 Phosphonate B 50 0.6; 0.7 6 5.2 9.4 Phosphonate B 100 0.6 1.6 1.6; 1.3 1.3 18 Phosphonate B 200 16; 12 Phosphonate B 250 0.5 Phosphonate B 500 0.5 Phosphonate B 550 12 Phosphonate C 25 0.6 60 103 58 Phosphonate C 50 0.2 4.6 10 20 33 Phosphonate D 25 1.8; 1.9 65 91 Phosphonate D 50 0.1; 0.3 5.2 6.1 9.4 38 Phosphonate D 75 2.7 5.2 4.3 34 Phosphonate D 100 2.4 ppm/ ppm Sebacic 50/50 6.6 acid/TEA Sebacic 100/100 1.4 acid/TEA Sebacic 250/250 <0.05 30; 31 32 26 62; 60 acid/TEA Sebacic 500/500 <0.05; 47 46 38 <0.05; acid/TEA <0.05 <0.05 - As shown in Table II, in order to obtain corrosion inhibition in the CR water, the preferred diacid is sebacic acid, at a concentration of at least 500 ppm. The preferred amine is triethanol amine (TEA). The preferred mass ratio of diacid (e.g., sebacic) to amine is at least 1:1. An increase of the concentrations of sebacic acid/TEA does not provide corrosion inhibition in all the synthetic waters. The worst protection is in the AGG, AGG* and A/Fe synthetic waters. As shown in Table II, in TRV and CR waters, sebacic acid/TEA at 500 ppm/500 ppm provides good corrosion protection, i.e., less than 0.05 mpy, in such waters. This is in contrast to its performance in AGG, AGG* and A/Fe waters; in those waters, corrosion protection is on the order of greater than 38 mpy.
- Phosphonates are known to be useful corrosion inhibitors. However, as shown in Table II, none of the phosphonates tested offered effective corrosion protection for the CR water. The performance in the other synthetic waters was less effective than the benchmark; increasing their concentration did not radically change performance, especially in the CR water.
TABLE III Corrosion rates measured in waters as defined in text, units of mils per year (mpy) for low carbon steel metallurgy for the synergetic mixtures of phosphonates and diacids/amine. Diacid/ Phosphonate ppm amine ppm/ppm TRV AGG AGG* A/Fe CR A 75 Sebacic/ 500/ <0.05 0.1 0.1 0.9 <0.05 TEA 500 A 50 Sebacic/ 500/ <0.05 0.05 0.05 0.1 TEA 500 B 30 Sebacic/ 500/ <0.05; <0.05; TEA 500 <0.05 1.5 B 50 Sebacic/ 500/ <0.05 0.05 <0.05 0.1 <0.05 TEA 500 C 50 Sebacic/ 500/ <0.05 <0.05; <0.05; <0.05; 0.05; TEA 500 <0.05 <0.05; <0.05 0.1 0.1 D 50 Sebacic/ 500/ <0.05 0.05; 0.1 <0.05 TEA 500 <0.05 - As shown in Table III, it was found that the combination of organic diacid/triamine with any of the four phosphonates tested provided excellent corrosion protection in all the synthetic waters, when sebacic acid/triethanol amine are at least at 500 ppm of each and the phosphonates are at least 50 ppm as actives. The performance achieved at the above mentioned concentrations in the AGG, AGG* and A/Fe synthetic waters is unexpected and can be explained by a synergistic effect of the mixtures. Please note that none of the individual components can give protection of greater than 90% in that set of waters, and the combination provides protection of equal or greater than 99.9 %. Table IV further demonstrates the unexpected results of the combination of diacid/amine/phosphonate, wherein a comparison of the corrosion rates in mpy as measured and as predicted is presented. The predicted corrosion rate is: a) calculated averaging the corrosion rates of the individual inhibitors phosphonate and diacid/amine, b) the corrosion rate as obtained with the best performer of the two, and c) calculated assuming a decrease in the corrosion rate of the best performer as the reduction on the rate of corrosion between the control water and the same water treated by the other inhibitor.
TABLE IV mpy as TRV AGG AAG* A/Fe CR Phosphonate A 50 ppm, sebacic acid 500 ppm, triethanol amine 500 ppm. Measured <0.05 0.05 0.05 0.1 Predicted by a) 0.35 28.1 63 46 27 Predicted by b) <0.05 9.2 46 9.4 <0.05 Predicted by c) <0.05 3.1 40.4 22.1 <0.05 Phosphonate B 50 ppm, sebacic acid 500 ppm, triethanol amine 500 ppm. Measured <0.05 0.05 <0.05 0.1 <0.05 Predicted by a) 0.35 26.5 25.5 23.7 15 Predicted by b) <0.05 6 5.2 9.4 <0.05 Predicted by c) <0.05 2.1 2.6 3.9 <0.05 Phosphonate C 50 ppm, sebacic acid 500 ppm, triethanol amine 500 ppm. Measured <0.05; <0.05; <0.05; <0.05; 0.1 <0.05 <0.05; <0.05 0.1 Predicted by a) 0.1 25.8 28 29 16.5 Predicted by b) <0.05 9.2 46 9.4 <0.05 Predicted by c) <0.05 1.6 5.1 8.2 <0.05 Phosphonate D 50 ppm, sebacic acid 500 ppm, triethanol amine 500 ppm. Measured <0.05 <0.05; <0.05; 0.1 <0.05 <0.05 <0.05 Predicted by a) 0.1 26.1 26.1 23.7 19 Predicted by b) <0.05 5.2 6.1 9.4 <0.05 Predicted by c) <0.05 1.8 3.1 3.9 <0.05 - As shown in Table IV, none of the predictions can account for the measured results. The nearest is the prediction by method c), but even by this prediction, the corrosion rate is still at least 30 times larger than any of the measured ones.
- In a preferred embodiment, from about 200-1,000 ppm of sebacic acid, about 200-1,000 ppm of triethanolamine and about 25-100 ppm of polyisopropenyl phosphonic material may be added to the system in need of treatment. The polyisopropenyl phosphonic material may be made in organic solution or aqueous media.
- While this invention has been described with respect to particular embodiments thereof, it is apparent that numerous other forms and modifications of this invention will be obvious to those skilled in the art. The appended claims in this invention generally should be construed to cover all such obvious forms and modifications which are within the true spirit and scope of the present invention.
Claims (15)
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/343,709 US7632458B2 (en) | 2006-01-31 | 2006-01-31 | Corrosion inhibitor treatment for closed loop systems |
PCT/US2007/000674 WO2007089405A2 (en) | 2006-01-31 | 2007-01-11 | Corrosion inhibitor treatment for closed loop systems |
ES07762859.2T ES2575519T3 (en) | 2006-01-31 | 2007-01-11 | Corrosion inhibitor treatment for closed loop systems |
MYPI20082569A MY147751A (en) | 2006-01-31 | 2007-01-11 | Corrosion inhibitor treatment for closed loop systems |
CN2007800041122A CN101379221B (en) | 2006-01-31 | 2007-01-11 | Corrosion inhibitor treatment for closed loop systems |
CA2637571A CA2637571C (en) | 2006-01-31 | 2007-01-11 | Corrosion inhibitor treatment for closed loop systems |
KR1020087018872A KR101375045B1 (en) | 2006-01-31 | 2007-01-11 | Corrosion inhibitor treatment for closed loop systems |
BRPI0706963A BRPI0706963B8 (en) | 2006-01-31 | 2007-01-11 | method for inhibiting corrosion on metal surfaces in contact with a fluid contained in a closed loop industrial fluid system |
EP07762859.2A EP1987173B1 (en) | 2006-01-31 | 2007-01-11 | Corrosion inhibitor treatment for closed loop systems |
ZA2008/07068A ZA200807068B (en) | 2006-01-31 | 2008-08-15 | Corrosion inhibitor treatment for closed loop system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/343,709 US7632458B2 (en) | 2006-01-31 | 2006-01-31 | Corrosion inhibitor treatment for closed loop systems |
Publications (2)
Publication Number | Publication Date |
---|---|
US20070178008A1 true US20070178008A1 (en) | 2007-08-02 |
US7632458B2 US7632458B2 (en) | 2009-12-15 |
Family
ID=38138396
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/343,709 Active US7632458B2 (en) | 2006-01-31 | 2006-01-31 | Corrosion inhibitor treatment for closed loop systems |
Country Status (10)
Country | Link |
---|---|
US (1) | US7632458B2 (en) |
EP (1) | EP1987173B1 (en) |
KR (1) | KR101375045B1 (en) |
CN (1) | CN101379221B (en) |
BR (1) | BRPI0706963B8 (en) |
CA (1) | CA2637571C (en) |
ES (1) | ES2575519T3 (en) |
MY (1) | MY147751A (en) |
WO (1) | WO2007089405A2 (en) |
ZA (1) | ZA200807068B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BR112013033068B1 (en) * | 2011-06-29 | 2019-02-12 | Bl Technologies, Inc. | STERILIZATION / PASTEURIZATION COMPOSITION AND STERILIZATION METHOD |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4045253A (en) * | 1976-03-15 | 1977-08-30 | Halliburton Company | Passivating metal surfaces |
US4406811A (en) * | 1980-01-16 | 1983-09-27 | Nalco Chemical Company | Composition and method for controlling corrosion in aqueous systems |
US4446046A (en) * | 1981-06-17 | 1984-05-01 | Betz Laboratories, Inc. | Poly (alkenyl) phosphonic acid and methods of use thereof |
US4533481A (en) * | 1983-04-20 | 1985-08-06 | The Lubrizol Corporation | Polycarboxylic acid/boric acid/amine salts and aqueous systems containing same |
US4606890A (en) * | 1983-03-03 | 1986-08-19 | Ciba-Geigy Corporation | Process for conditioning metal surfaces |
US4828795A (en) * | 1981-09-04 | 1989-05-09 | Ciba-Geigy Corporation | Systems inhibited against corrosion and/or scale deposition |
US4927550A (en) * | 1989-01-27 | 1990-05-22 | Castrol Industrial Inc. | Corrosion preventive composition |
US5431834A (en) * | 1991-10-10 | 1995-07-11 | Berol Nobel Ab | Use of a triethanolamine product mixture |
US5519102A (en) * | 1995-05-09 | 1996-05-21 | Betz Laboratories, Inc. | Aqueous polymerization method for poly(isopropenylphosphonic acid) |
US5531937A (en) * | 1994-11-08 | 1996-07-02 | Betz Laboratories, Inc. | Water soluble cyclic amine-dicarboxylic acid-alkanol amine salt corrosion inhibitor |
US6841125B1 (en) * | 2000-09-20 | 2005-01-11 | Whi Usa, Inc. | Method and apparatus to clean and apply foamed corrosion inhibitor to ferrous surfaces |
US20050032664A1 (en) * | 2003-08-05 | 2005-02-10 | Tony Gichuhi | Corrosion inhibitor |
US20070001150A1 (en) * | 2005-06-29 | 2007-01-04 | Hudgens Roy D | Corrosion-inhibiting composition and method of use |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3111209A1 (en) | 1981-03-21 | 1982-09-30 | Hoechst Ag, 6000 Frankfurt | HIGH MOLECULAR PIPERIDING GROUP-CONTAINING ESTERS AND URETHANES, METHOD FOR THE PRODUCTION THEREOF, THEIR USE AS STABILIZERS FOR POLYMERS AND POLYMERS CONTAINING THESE COMPOUNDS |
JPS58206676A (en) | 1982-05-27 | 1983-12-01 | Ipposha Oil Ind Co Ltd | Corrosion inhibitor for cooling water |
JPS6033371A (en) | 1983-08-03 | 1985-02-20 | Chiyoda Kagaku Kenkyusho:Kk | Corrosion inhibitor |
JPS61117288A (en) | 1984-04-04 | 1986-06-04 | Chiyoda Kagaku Kenkyusho:Kk | Corrosion inhibitor for iron and iron alloy |
CN1060538C (en) * | 1997-12-08 | 2001-01-10 | 中国科学院福建物质结构研究所二部 | Corrosion-inhibition of iron and steel in tap water |
ATE270352T1 (en) | 1999-03-30 | 2004-07-15 | Stefan Graichen | ANTI-CORROSIVE AGENT CONTAINING MELAMINE |
JP2003253478A (en) | 2002-03-01 | 2003-09-10 | Japan Organo Co Ltd | Organic anticorrosive for aqueous system and corrosion inhibition method for aqueous system |
WO2006071996A2 (en) | 2004-12-29 | 2006-07-06 | Trahan David O | Corrosion inhibitors |
-
2006
- 2006-01-31 US US11/343,709 patent/US7632458B2/en active Active
-
2007
- 2007-01-11 KR KR1020087018872A patent/KR101375045B1/en active IP Right Grant
- 2007-01-11 CN CN2007800041122A patent/CN101379221B/en active Active
- 2007-01-11 BR BRPI0706963A patent/BRPI0706963B8/en active IP Right Grant
- 2007-01-11 CA CA2637571A patent/CA2637571C/en active Active
- 2007-01-11 ES ES07762859.2T patent/ES2575519T3/en active Active
- 2007-01-11 MY MYPI20082569A patent/MY147751A/en unknown
- 2007-01-11 EP EP07762859.2A patent/EP1987173B1/en active Active
- 2007-01-11 WO PCT/US2007/000674 patent/WO2007089405A2/en active Application Filing
-
2008
- 2008-08-15 ZA ZA2008/07068A patent/ZA200807068B/en unknown
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4045253A (en) * | 1976-03-15 | 1977-08-30 | Halliburton Company | Passivating metal surfaces |
US4406811A (en) * | 1980-01-16 | 1983-09-27 | Nalco Chemical Company | Composition and method for controlling corrosion in aqueous systems |
US4446046A (en) * | 1981-06-17 | 1984-05-01 | Betz Laboratories, Inc. | Poly (alkenyl) phosphonic acid and methods of use thereof |
US4828795A (en) * | 1981-09-04 | 1989-05-09 | Ciba-Geigy Corporation | Systems inhibited against corrosion and/or scale deposition |
US4606890A (en) * | 1983-03-03 | 1986-08-19 | Ciba-Geigy Corporation | Process for conditioning metal surfaces |
US4533481A (en) * | 1983-04-20 | 1985-08-06 | The Lubrizol Corporation | Polycarboxylic acid/boric acid/amine salts and aqueous systems containing same |
US4927550A (en) * | 1989-01-27 | 1990-05-22 | Castrol Industrial Inc. | Corrosion preventive composition |
US5431834A (en) * | 1991-10-10 | 1995-07-11 | Berol Nobel Ab | Use of a triethanolamine product mixture |
US5531937A (en) * | 1994-11-08 | 1996-07-02 | Betz Laboratories, Inc. | Water soluble cyclic amine-dicarboxylic acid-alkanol amine salt corrosion inhibitor |
US5519102A (en) * | 1995-05-09 | 1996-05-21 | Betz Laboratories, Inc. | Aqueous polymerization method for poly(isopropenylphosphonic acid) |
US6841125B1 (en) * | 2000-09-20 | 2005-01-11 | Whi Usa, Inc. | Method and apparatus to clean and apply foamed corrosion inhibitor to ferrous surfaces |
US20050032664A1 (en) * | 2003-08-05 | 2005-02-10 | Tony Gichuhi | Corrosion inhibitor |
US20070001150A1 (en) * | 2005-06-29 | 2007-01-04 | Hudgens Roy D | Corrosion-inhibiting composition and method of use |
Also Published As
Publication number | Publication date |
---|---|
WO2007089405A3 (en) | 2007-10-11 |
CA2637571C (en) | 2015-04-21 |
KR101375045B1 (en) | 2014-03-14 |
BRPI0706963B1 (en) | 2018-01-23 |
WO2007089405A2 (en) | 2007-08-09 |
CA2637571A1 (en) | 2007-08-09 |
EP1987173B1 (en) | 2016-03-30 |
MY147751A (en) | 2013-01-15 |
BRPI0706963A2 (en) | 2011-04-12 |
BRPI0706963B8 (en) | 2018-05-15 |
ZA200807068B (en) | 2009-08-26 |
KR20080092397A (en) | 2008-10-15 |
EP1987173A2 (en) | 2008-11-05 |
CN101379221A (en) | 2009-03-04 |
US7632458B2 (en) | 2009-12-15 |
ES2575519T3 (en) | 2016-06-29 |
CN101379221B (en) | 2012-07-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
LeChevallier et al. | Examining the relationship between iron corrosion and the disinfection of biofilm bacteria | |
CN111472006B (en) | Cleaning composition for carbon steel pipeline of nuclear power fire-fighting water system and preparation method thereof | |
Ali | Inhibition of mild steel corrosion in cooling systems by low-and non-toxic corrosion inhibitors | |
US7632458B2 (en) | Corrosion inhibitor treatment for closed loop systems | |
US20230061502A1 (en) | Protective compositions for use in systems comprising industrial water | |
de Assis Severiano et al. | Corrosion damages of flow regulation valves for water injection in oil fields | |
US7311877B2 (en) | Inhibition of corrosion in fluid systems | |
MX2008009539A (en) | Corrosion inhibitor treatment for closed loop systems | |
WO2009080498A1 (en) | Scale inhibition | |
US6723257B2 (en) | Corrosion inhibiting composition | |
WO2018183172A1 (en) | Corrosion inhibitors for passivation of galvanized coatings and carbon steel | |
Migahed | Environmental factors affecting corrosion inhibition in oil and gas industry | |
Royani et al. | Corrosion rate and corrosion behaviour analysis of carbon steel pipe at constant condensed fluid | |
Royani et al. | Corrosion Behavior of Low Carbon Steel Pipe in Condensate Environment | |
CA2495020C (en) | Corrosion inhibiting composition | |
Patel et al. | Alternative To The Use Of Phosphonates In Cooling Water Systems | |
Hali et al. | The use of preservation chemicals for extended shut-ins following hydrostatic testing of gas and service pipelines | |
WO2000039359A1 (en) | Corrosion inhibitor compositions and methods to control metal corrosion in brine systems | |
Ivanenko et al. | Chemical means of equipment protection during oil and gas fields operation | |
KR101430043B1 (en) | Equipment-protective compound of a closed heat-system | |
De Turris et al. | Synergistic Effect of Sulphate-Reducing Bacteria and CO2 on the Corrosion of Carbon Steel and Chemical Treatment to Control it | |
Kameli et al. | Diagnosis of heat exchanger scales in cooling water systems | |
Raheem | Evaluation of Mixed Corrosion Inhibitors in Cooling Water System | |
Crovetto et al. | New Organic Closed Loop Corrosion Inhibitor | |
JPH02305983A (en) | Novel corrosion inhibitor of copper and cop- per alloy |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GENERAL ELECTRIC COMPANY, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CROVETTO, ROSA;MAY, ROGER C.;LUE, PING;AND OTHERS;REEL/FRAME:017489/0785;SIGNING DATES FROM 20060130 TO 20060201 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
AS | Assignment |
Owner name: BL TECHNOLOGIES, INC., MINNESOTA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GENERAL ELECTRIC COMPANY;REEL/FRAME:047502/0065 Effective date: 20170929 |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 12 |